Imported existing code

indra/llrender/llglstates.h

@@ -0,0 +1,285 @@
+/** 
+ * @file llglstates.h
+ * @brief LLGL states definitions
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+//THIS HEADER SHOULD ONLY BE INCLUDED FROM llgl.h
+#ifndef LL_LLGLSTATES_H
+#define LL_LLGLSTATES_H
+
+#include "llimagegl.h"
+
+//----------------------------------------------------------------------------
+
+class LLGLDepthTest
+{
+	// Enabled by default
+public:
+	LLGLDepthTest(GLboolean depth_enabled, GLboolean write_enabled = GL_TRUE, GLenum depth_func = GL_LEQUAL);
+	
+	~LLGLDepthTest();
+	
+	GLboolean mPrevDepthEnabled;
+	GLenum mPrevDepthFunc;
+	GLboolean mPrevWriteEnabled;
+private:
+	static GLboolean sDepthEnabled; // defaults to GL_FALSE
+	static GLenum sDepthFunc; // defaults to GL_LESS
+	static GLboolean sWriteEnabled; // defaults to GL_TRUE
+};
+
+//----------------------------------------------------------------------------
+
+class LLGLSDefault
+{
+protected:
+	LLGLEnable mColorMaterial;
+	LLGLDisable mAlphaTest, mBlend, mCullFace, mDither, mFog, 
+		mLineSmooth, mLineStipple, mNormalize, mPolygonSmooth,
+		mTextureGenQ, mTextureGenR, mTextureGenS, mTextureGenT,
+		mGLMultisample;
+public:
+	LLGLSDefault()
+		:
+		// Enable
+		mColorMaterial(GL_COLOR_MATERIAL),
+		// Disable
+		mAlphaTest(GL_ALPHA_TEST),
+		mBlend(GL_BLEND), 
+		mCullFace(GL_CULL_FACE),
+		mDither(GL_DITHER),
+		mFog(GL_FOG), 
+		mLineSmooth(GL_LINE_SMOOTH),
+		mLineStipple(GL_LINE_STIPPLE),
+		mNormalize(GL_NORMALIZE),
+		mPolygonSmooth(GL_POLYGON_SMOOTH),
+		mTextureGenQ(GL_TEXTURE_GEN_Q), 
+		mTextureGenR(GL_TEXTURE_GEN_R),
+		mTextureGenS(GL_TEXTURE_GEN_S), 
+		mTextureGenT(GL_TEXTURE_GEN_T),
+		mGLMultisample(GL_MULTISAMPLE_ARB)
+	{ }
+};
+
+class LLGLSObjectSelect
+{ 
+protected:
+	LLGLDisable mBlend, mFog, mAlphaTest;
+	LLGLEnable mCullFace;
+public:
+	LLGLSObjectSelect()
+		: mBlend(GL_BLEND), mFog(GL_FOG), 
+		  mAlphaTest(GL_ALPHA_TEST),
+		  mCullFace(GL_CULL_FACE)
+	{ }
+};
+
+class LLGLSObjectSelectAlpha
+{
+protected:
+	LLGLEnable mAlphaTest;
+public:
+	LLGLSObjectSelectAlpha()
+		: mAlphaTest(GL_ALPHA_TEST)
+	{}
+};
+
+//----------------------------------------------------------------------------
+
+class LLGLSUIDefault
+{ 
+protected:
+	LLGLEnable mBlend, mAlphaTest;
+	LLGLDisable mCullFace;
+	LLGLDepthTest mDepthTest;
+public:
+	LLGLSUIDefault() 
+		: mBlend(GL_BLEND), mAlphaTest(GL_ALPHA_TEST),
+		  mCullFace(GL_CULL_FACE),
+		  mDepthTest(GL_FALSE, GL_TRUE, GL_LEQUAL)
+	{}
+};
+
+class LLGLSNoAlphaTest // : public LLGLSUIDefault
+{
+protected:
+	LLGLDisable mAlphaTest;
+public:
+	LLGLSNoAlphaTest()
+		: mAlphaTest(GL_ALPHA_TEST)
+	{}
+};
+
+//----------------------------------------------------------------------------
+
+class LLGLSFog
+{
+protected:
+	LLGLEnable mFog;
+public:
+	LLGLSFog()
+		: mFog(GL_FOG)
+	{}
+};
+
+class LLGLSNoFog
+{
+protected:
+	LLGLDisable mFog;
+public:
+	LLGLSNoFog()
+		: mFog(GL_FOG)
+	{}
+};
+
+//----------------------------------------------------------------------------
+
+class LLGLSPipeline
+{ 
+protected:
+	LLGLEnable mCullFace;
+	LLGLDepthTest mDepthTest;
+public:
+	LLGLSPipeline()
+		: mCullFace(GL_CULL_FACE),
+		  mDepthTest(GL_TRUE, GL_TRUE, GL_LEQUAL)
+	{ }		
+};
+
+class LLGLSPipelineAlpha // : public LLGLSPipeline
+{ 
+protected:
+	LLGLEnable mBlend, mAlphaTest;
+public:
+	LLGLSPipelineAlpha()
+		: mBlend(GL_BLEND),
+		  mAlphaTest(GL_ALPHA_TEST)
+	{ }
+};
+
+class LLGLSPipelineEmbossBump
+{
+protected:
+	LLGLDisable mFog;
+public:
+	LLGLSPipelineEmbossBump()
+		: mFog(GL_FOG)
+	{ }
+};
+
+class LLGLSPipelineSelection
+{ 
+protected:
+	LLGLDisable mCullFace;
+public:
+	LLGLSPipelineSelection()
+		: mCullFace(GL_CULL_FACE)
+	{}
+};
+
+class LLGLSPipelineAvatar
+{
+protected:
+	LLGLEnable mNormalize;
+public:
+	LLGLSPipelineAvatar()
+		: mNormalize(GL_NORMALIZE)
+	{}
+};
+
+class LLGLSPipelineSkyBox
+{ 
+protected:
+	LLGLDisable mAlphaTest, mCullFace, mFog;
+public:
+	LLGLSPipelineSkyBox()
+		: mAlphaTest(GL_ALPHA_TEST), mCullFace(GL_CULL_FACE), mFog(GL_FOG)
+	{ }
+};
+
+class LLGLSTracker
+{
+protected:
+	LLGLEnable mCullFace, mBlend, mAlphaTest;
+public:
+	LLGLSTracker() :
+		mCullFace(GL_CULL_FACE),
+		mBlend(GL_BLEND),
+		mAlphaTest(GL_ALPHA_TEST)
+		
+	{ }
+};
+
+//----------------------------------------------------------------------------
+
+class LLGLSSpecular
+{
+public:
+	LLGLSSpecular(const LLColor4& color, F32 shininess)
+	{
+		if (shininess > 0.0f)
+		{
+			glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, color.mV);
+			S32 shiny = (S32)(shininess*128.f);
+			shiny = llclamp(shiny,0,128);
+			glMateriali(GL_FRONT_AND_BACK, GL_SHININESS, shiny);
+		}
+	}
+	~LLGLSSpecular()
+	{
+		glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, LLColor4(0.f,0.f,0.f,0.f).mV);
+		glMateriali(GL_FRONT_AND_BACK, GL_SHININESS, 0);
+	}
+};
+
+//----------------------------------------------------------------------------
+
+
+class LLGLSBlendFunc : public LLGLSPipeline {
+protected:
+	GLint mSavedSrc, mSavedDst;
+	LLGLEnable mBlend;
+
+public:
+	LLGLSBlendFunc(GLenum srcFunc, GLenum dstFunc) :
+		mBlend(GL_BLEND)
+	{
+		glGetIntegerv(GL_BLEND_SRC, &mSavedSrc);
+		glGetIntegerv(GL_BLEND_DST, &mSavedDst);
+		glBlendFunc(srcFunc, dstFunc);
+	}
+
+	~LLGLSBlendFunc(void) {
+		glBlendFunc(mSavedSrc, mSavedDst);
+	}
+};
+
+
+#endif